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Generator not running smoothly under load

My generator rpm's go up and down continuously when there is a constant load. This is not a refrigerator compressor kicking in or anything like that. For instance, it will do it with a fan running and a light on. The generator runs smoothly with no load. Any ideas ???

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Hi

I think it is because the governor sistem.(no properly working).Perhaps the governor lever spring is tightened.There is a screw to adjust it,try to locate it.Hope this helps.

regards savumihai71

Posted on Dec 13, 2008

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Generator had been running for 3 hours with a/c and refrigerator and lights (on concession trailer)when we experienced a loss


the unit has gone into over load
The total power requirement has exceed the output of the generator
for example if the generator is a 2.500 kw or kva then it will generate well at 1.8 kva or kw but it will not run forever at 2.5 kva -kw
When a ac is running the power requirement will be constant on the generator and with the fridge as well then the load will be at the maximum out put of the unit.
when the fridge starts again the extra load will exceed the max out put of the generator and it will slow down ( lights dimming ) and eventually go into overload mode
have an accredited electrician calculate your maximum load requirement for an external power supply and then get a unit that is at least 15.. kva kw better that required
generally fridges use 1000watts , ac conditions will draw over 3000watts and any thing else adds up . I am guessing that your generator is only 2500 unit

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On the engines carb. is a governor rod should connect to the front case of the engine. This rod should have an adjustment to slow the engine speed. BUT,,, are you reading the generator unloaded or without any thing plunged into it? Once you have the generator loaded with a device, the voltage should drop to a constant 240vac. 150 rpms should not make that big a difference on the voltage output, and if running under load the RPM's should drop also..

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Make sure all the springs that go to the carb and govenor are in place. some of them are just used to keep the linkage tight so there isn't any play. Another possibility is that the mixture on the carb is not set right. If you have an adjustment for the mixture, you can try to adjust it. With the engine running and warmed up. Turn the main jet adjustment screw (usually located at the bottom of the bowl) in till the engine RPM's start to drop. Then back it out til the engine runs smooth again. I would back it out another 1/4 turn and try it there. They tend to run better if they are set a little on the rich side.

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